If committing atomic pages is failed when doing f2fs_do_sync_file(), we can
get commited pages but atomic_file being still set like:
- inmem: 0, atomic IO: 4 (Max. 10), volatile IO: 0 (Max. 0)
If GC selects this block, we can get an infinite loop like this:
f2fs_submit_page_bio: dev = (253,7), ino = 2, page_index = 0x2359a8, oldaddr =
0x2359a8, newaddr = 0x2359a8, rw = READ(), type = COLD_DATA
f2fs_submit_read_bio: dev = (253,7)/(253,7), rw = READ(), DATA, sector =
18533696, size = 4096
f2fs_get_victim: dev = (253,7), type = No TYPE, policy = (Foreground GC,
LFS-mode, Greedy), victim = 4355, cost = 1, ofs_unit = 1, pre_victim_secno =
4355, prefree = 0, free = 234
f2fs_iget: dev = (253,7), ino = 6247, pino = 5845, i_mode = 0x81b0, i_size =
319488, i_nlink = 1, i_blocks = 624, i_advise = 0x2c
f2fs_submit_page_bio: dev = (253,7), ino = 2, page_index = 0x2359a8, oldaddr =
0x2359a8, newaddr = 0x2359a8, rw = READ(), type = COLD_DATA
f2fs_submit_read_bio: dev = (253,7)/(253,7), rw = READ(), DATA, sector =
18533696, size = 4096
f2fs_get_victim: dev = (253,7), type = No TYPE, policy = (Foreground GC,
LFS-mode, Greedy), victim = 4355, cost = 1, ofs_unit = 1, pre_victim_secno =
4355, prefree = 0, free = 234
f2fs_iget: dev = (253,7), ino = 6247, pino = 5845, i_mode = 0x81b0, i_size =
319488, i_nlink = 1, i_blocks = 624, i_advise = 0x2c
In that moment, we can observe:
[Before]
Try to move 5084219 blocks (BG: 384508)
- data blocks : 4962373 (274483)
- node blocks : 121846 (110025)
Skipped : atomic write 4534686 (10)
[After]
Try to move 5088973 blocks (BG: 384508)
- data blocks : 4967127 (274483)
- node blocks : 121846 (110025)
Skipped : atomic write 4539440 (10)
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
fs/f2fs/file.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 7ae2f3bd8c2f..68b6da734e5f 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1997,11 +1997,11 @@ static int f2fs_ioc_commit_atomic_write(struct file
*filp)
goto err_out;
ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true);
- if (!ret) {
- clear_inode_flag(inode, FI_ATOMIC_FILE);
- F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC] = 0;
- stat_dec_atomic_write(inode);
- }
+
+ /* doesn't need to check error */
+ clear_inode_flag(inode, FI_ATOMIC_FILE);
+ F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC] = 0;
+ stat_dec_atomic_write(inode);
} else {
ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 1, false);
}
--
2.19.0.605.g01d371f741-goog
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